Selection for postweaning gain in rats

III. Correlated response in maternal performance.

J. G. Rios, Merlyn K Nielsen, G. E. Dickerson

Research output: Contribution to journalArticle

Abstract

Effects from 34 generations of selection, either up (U) or down (D), for 3- to 9-wk weight gain on genetic direct and postnatal maternal effects, dam size and maternal efficiency were evaluated in 25 cross-fostered sets of rats. Direct genetic effects on 12-d pup weight were 14 and 9% above controls (C) for U and D lines, respectively (P less than .01). Postnatal maternal effects on 12-d pup weight were also 11% higher for the U line (P less than .01), but not different from C for the D line. Females of the U line were heavier (P less than .01) by 13% at mating, 12% at parturition and 15% at 12 d of lactation, relative to controls. They also produced 11% greater total litter weight at 12 d and consumed 9% more feed, but were only nonsignificantly lower in feed per unit of pup 12-d litter weight. Females of D line were -8, -7 and -3% relative to controls in the three weights, but did not differ from controls in 12-d litter weight, feed consumed or in feed efficiency during lactation.

Original languageEnglish (US)
Pages (from-to)54-58
Number of pages5
JournalJournal of animal science
Volume63
Issue number1
DOIs
StatePublished - Jan 1 1986

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litter weight
correlated responses
pups
Mothers
maternal effect
Weights and Measures
rats
lactation
dams (mothers)
Lactation
feed conversion
weight gain
parturition
Cohort Effect
Weight Gain
Parturition

ASJC Scopus subject areas

  • Food Science
  • Animal Science and Zoology
  • Genetics

Cite this

Selection for postweaning gain in rats : III. Correlated response in maternal performance. / Rios, J. G.; Nielsen, Merlyn K; Dickerson, G. E.

In: Journal of animal science, Vol. 63, No. 1, 01.01.1986, p. 54-58.

Research output: Contribution to journalArticle

Rios, J. G. ; Nielsen, Merlyn K ; Dickerson, G. E. / Selection for postweaning gain in rats : III. Correlated response in maternal performance. In: Journal of animal science. 1986 ; Vol. 63, No. 1. pp. 54-58.
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